No 78 at Thirlmere, on the day of its official unveiling, first Sunday of March, 1998. On your page, you list No 78 as No 1, saying that No 1 visited Thirlmere during the 1970's. I'd suggest that No 1 hasn't been out of Sydney since mid 1877, when it was placed on shunting duties. Certainly, since the Powerhouse Museum has had it in their custody/ownership (since 1879) No 1 hasn't been further from the centre of Sydney than Castle Hill, where it was extensively restored in the early 1980's.

No 78 was constructed to the same design as No1, indeed No 78 was one of a batch of four constructed on what were originally intended to be replacement frames for Nos 1-4. The tender that No 78 had, whilst in service and up to 1938, was one taken from Nos 1-4. This tender finally returned to No 1 in 1938, when No 1 was displayed in Martin Place for the Sesqui-Centenary of settlement celebrations. No 78 received a modified Z-24 Class tender for display at Enfield, which it retained until 1976. This tender was too badly rusted to be salvageable, so it was replaced with the original tender taken from 1709 in 1964. Circa1980, the Z-17 Class tender was replaced by a tender construced on the frames of the former SMR Weedkiller wagon, which was originally a tender off one of Nos 1N, 2N, or 3N (later Nos 388, 389, 390).